NASA

NASA stands for National Aeronautics and Space Administration. It is the agency of the U.S. government that is responsible for the space program. NASA was formed in 1958 and began operations on October 1, 1958.

Extraterrestrial hypothesis

Extraterrestrial hypothesis is the belief that some unidentified flying objects are extraterrestrial life from other planets occupying actual spacecraft that are visiting Earth.

Ancient astronauts

Ancient astronauts are supposed intelligent extraterrestrial beings that were said to have visited Earth in ancient times and made contact with humans. This contact helped the development of humans, technologies, religions, and other areas.

Zoo hypothesis

The zoo hypothesis states that highly advanced extraterrestrial life does exists, but they will not contact life on Earth in order to allow for our natural evolution.

Planetary geology

Planetary geology is the study of the geology of celestial bodies. Planets, their moons, asteroids, comets, and meteorites in the Universe.

Stars - facts 6

The largest known star is NML Cygni. It is 1,650 times the Sun's radius. This would make NML Cygni is approximately 713,130,000 miles in radius and 1,426,260,000 miles in diameter.

Stars - facts 5

The brightest star in the night sky is Sirius.